Recovery of stock



Feb, 5, 1924. C. F. SISSON ET AL` RECOVERY OF STOCK ed May 25. 1921 III IIIIIIIIIIII lll IIIII ILL'IL :I i I I I I l I l Patented Feb. 5, 1924;

CLEMENT F. SSSON AND HARRY E. EUBICH, F WHTE PIGEON, MICHXGAN.

RECOVERY 0F STOCK.

Application led May 25, 1921. Serial No. 472,608.

To all whom t 'may concern:

Be it known that we,C`L;eM11N'r F. SlssoN and Hmm' E. EURICH, citizens of the `United States, residing at White Pigeon, in the county of Saint Joseph and State of Michigan, have invented certain new and useful improvements in the Recovery of Stock, of which the following is a specification.

The present invention relates to the recov- 19 ery of stock.

ore particularly the present invention relates to a process and apparatus for recovering paper stock from solid manila and other boX boards and papers which have been paraftned. Parafiined stock of this nature is commonly used for cartons for carrying oily or greasy materials. Heretofore, it has been common practice to destroy said cartons if they are made of improper size or misprinted, or for any other reason unusable for the original purpose. Box factories have been in the habit of burning large quan tities of stock of this nature.

An object of the present invention is to provide a cheap and efficient method of recovering the stock from this paraflined material.

A further object is to provide an efficient apparatus for recovering stock.

Further objects will appear as the description proceeds.

The one ligure in the drawing illustrates diagrammatically one embodiment of the present invention.

The reference character P indicates a pulper by means of which waste stock is reduced to a pulp. The character C represents a battery of steam chests in which the material is treated for the removal of paraffin. The character R represents a reservoir for receiving the paper pulp and the character W represents an apparatus which is known in the paper making art as a wet machine.

The pulper P may consist of a casing 1 having a shaft 2 extendingr longitudinallyT thereof. Said shaft 2 may be driven by the gear 3 which may in turn be driven by the pulley 4. The shaft 2 may be provided with a plurality of beaters 5 which, in combination with arms 5 on the casing 1 will have the function of completely shredding and pulping the stock to be treated. A conveyor 6. will urge the pulp in a right hand direction. The numeral 7 indicates an inlet for steam and water. The contents of the pulper P, should be maintained at a relatively high temperature. ln practice, temperatures between 200 and 250 degrees Fahrenheit will be found satisfactory. The pulp Within the pulper P, will be forced in a right hand direction and will be discharged through the outlet 8, into the battery'of steam or storage chests C.

Of the battery of steam or storage chests. only two have been shown in the drawing. It will be clear however, that any desired number of chests may be included in the battery. 0f the chests illustrated, that one indicated by the numeral 9 is provided with an inlet hopper l() to receive pulp from the outlet 8 of the pulper. Said chest 9 has comw munication with the chest 10 by means of the pipe 11, which may be provided with a valve 12. The chest 9 will preferably be mounted above the chest 10 whereby the pulp will flow by gravity from said chest 9 to chest 10. Chest 9 is provided with a longitudinal shaft 13 which may be driven by a pulley 14. Saidshaft 13 is provided with a plurality of agitators 15-15. Chest 10 is provided with a longitudinal shaft 16 which may be driven by a pulley 17. Said shaft 16 is provided with a plurality of'agitators 17-17. Chest 10 may have communication with the atmosphere through the pipe 18 which leads o from the upper part of said chest 10. A system of steam piping 19` affords access of steam to chests 9 and 10. Communicating with the lower part of the chest 10, is a pipe 20 which may be provided with a valve 21. Connected with the pipe 20 is a force pump 22 which may be driven from any convenient source of power and which operates to force the pulp from the lower part of the chest 10 up to the reservoir R through the pipe 23. rllhe reservoir R, is provided with a diaphragm or baffle 24. which separates the pipe 23 from the outlet pipe 25. This outlet pipe 25 communicates with the upper parts of chests 9 and 10, thereby forminga circulating system con- Sistine of chests 9 and 10, pipe 20, pump 22. pipe 23, reservoir R and pipe 25. The reservoir R is provided with an outlet pipe 26 which leadsfrom that sideiof the reservoir R with which pipe 23 communicates. Said outlet pipe '26 should have communication with reservoir R at a point not higher than the. top of the diaphragm 24.

The outlet pipe 26 leads to the apparatus which has been referred to above as a wet machine. This wet machine may be of any preferred, construction and the details thereof form no part of the present invention. It is suilicient to state that the -wet machine has the function of separating'the pulp from the liquor carrying said pulp and to form said pulp into paper stock and will preferably be provided with a system of piping 27 for supglying hot water to the pulp. Some of the etails of a wet machine now in extensive use are illustrated schematically in the drawing. Inasmuch as a complete understanding of the present invention does not require a description of these details, nothing more concerning them need be recited in this specification. A preferred mode of practicing the present invention is substantlally as follows:

Waste material comprisingparaiined material such as manila and other box boards and papers, is fed into the pulper P. This stock is agitated in the resence of steam and Water at a relatively igh temperature. As indicated above, this temperature may in practice range from 200 to 250 degrees Fahrenheit. The pulp will be fed to the discharge outlet 8 and will be discharged through the hopper 10 to the chest 9. In the chests 9 and 10, the pulp will be subjected to an action of live steam and will be agitated by means of the agitators 15 and 17. Inasmuch as the stock is thoroughly shredded and disintegrated, the paraiiin will be dissolved out. In practice, it has been found satisfactory to treat the pulp in the chests 9 and 10 for a`period of six or seven hours, the temperature being maintained at approximately 212 degrees Fahrenheit. Inasmuch as the stock to be treated may contain printed matter, soda ash may be added to the chests 9 and 10 to remove the ink or other printing material from the pulp.

The pump 22 will force the pulp from the lower portion ofthe chest l10 up to the reservoir R. Said pulp is discharged through the outlet 26 substantially free of paraffin. In case the pump 22 supplies pulp to the reservoir R faster than said pulp can be handled by the wet machine W, the excess will flow over the diaphragm 24., through the pipe 25, back to the chests 9 and 10 and will receive further treatment. In the accompanying claims, the terms relatively high temperatures and relatively long time are to be understood to refer to temperatures and time necessary to ai'ect parailin.

One embodiment of the present invention has been described in detail. Many modifications wi11 occur to those skilled it th arf. It is intended in this atent to cover all such modifications that fal within the scope of the invention. as defined'by the appended claims.

What we claim as new and desire to secure by Letters Patent in the United States, 1s:

1. Apparatus for removing paraliin from stock comprising means for pulping said stock` storage means for treating the result- .ing pulp, a reservoir for treated pulp, and

means for leading overflow material from said reservoir back to said storage means.

2. Apparatus for removing paraiiin from stock comprising means for pulping said stock, storage means for treating the result ing pulp, a reservoir for treated pulp, a pump for deliveringI treated pulp from the lower portion of Said storage means to said reservoir and means for leading overflow material from said reservoir back to the upper part of said storage means.

3. Apparatus for the recovery of stock from waste material comprising, in combination, means for pulping said material under relatively high temperatures, storage means for treat-ing the resulting pulp, a reservoir for the reception of the treated pulp, said reservoir belng provided with means for directing overflow of pulp back into said storage means.

4. Apparatus for the recovery of stock from waste material comprising, in combination,.means for pulping saidmaterial under relatively high temperatures, storage means for treating the resulting pulp, a reservoir for the reception of the treated pulp, said reservoir being provided with means for directing overflow of pulp back into said storage means, said apparatus also including a Wet machine maintained at a relatively high temperature ensuring the removal of residual traces of soluble substances from said stock.

5. The method of recovering Stock from waste material which consists of shredding and pulping said material` leading the resulting pulp to storage chests, there treating said pulp with steam for a relatively long period of time to dissolve certain substances from said pulp, and passing said pulp through a wet machine which is maintained at a relatively high temperature to insure the removal of traces of soluble substances from said pulp.

6. The method for the recovery of stock from waste material which consists in shredding and pulping said material with hot 4water and steam and thereafter cooking said stock at a temperature of approximately 212 degrees F. for a period of at least six hours and conducting the treated stock to a wet machine supplied with hot water substan tially at'its boiling point.

7. rIhe method of treating raw stock conducting the treated'stock to a wet 'mawhich consists in thoroughly digesting said chine wherein said stock is treated with stock by agitation in the presence of very water at substantiall boilin temperature. 10 hot water, conducting said stock to a treat- Signed at White Xigeon, /jchigan7 this 5 ing chamber where said stock is cooked and 21st day of May, 1921. treated at a temperature of approximately CLEWNTgF. SKSSON. 212 degrees F. for at leastl six hours and then HARRY ]E.EUR1CH. 

